I hate to say it, but, unless they were ready to feed, the vamps would have little problem; it's when the Hunger is brought to the fore that Love hurts them, according to Thomas. Remember that he touched his brother when he was protected on numerous occasions, for everything from helping him to his feet to providing medical treatment. Now, the vamps wouldn't be comfortable in such a house, but, unless they're like Madeline and have impulse control issues, they probably wouldn't have any issues--unless and until they try to use some powers.
Now, here's another question: can certain Houses of Worship manage to become trappings of True Faith to the point of fulfilling House Skavis' Catch?